Welding gun for argon arc welding

Abstract

The invention discloses a welding gun for argon arc welding, and belongs to the technical field of welding guns for surfacing, the welding gun comprises a welding torch, an electrode mounted in the welding torch and a welding wire conveying device synchronously moving with the electrode, a first through hole is formed in the electrode, and the first through hole extends in the axial direction of the electrode and penetrates through the two ends of the electrode; the welding wire conveying device comprises two wire feeding pipes used for conveying welding wires, all the wire feeding pipes are located on the same side of the welding direction, the two wire feeding pipes are symmetrically arranged relative to the electrode, and the tail ends of all the wire feeding pipes point to the electrode; compared with a double-tungsten-electrode welding gun, the size of the welding gun can be reduced, and the welding gun is suitable for welding small-pipe-diameter workpieces; compared with a solid tungsten electrode, the hollow tungsten electrode can reduce the arc pressure in the welding process in the same large-current welding process so as to reduce the forming probability of a hump weld bead; the welding efficiency can be improved, the dilution rate can be reduced, interference to welding arcs can be reduced, and the welding stability is improved through double-path wire feeding.

Description

Technical Field

[0001] The invention relates to the technical field of welding guns for cladding, in particular to a welding gun for argon arc welding. Background Art

[0002] At present, the mainstream welding technologies are: single tungsten electrode single wire, that is, there is only one tungsten electrode and one welding wire outlet in a welding gun; double tungsten electrode single wire, that is, there are two tungsten electrodes and one welding wire outlet in a welding gun. For the single tungsten electrode single wire welding method, not only is the problem of hump weld prone to occur during high current welding, but the welding efficiency is low and the dilution rate is high; the double tungsten electrode single wire welding method requires two tungsten electrodes, so the welding gun is larger in size and cannot be used for welding small diameter workpieces, and its scope of use is limited.

[0003] Therefore, how to design a welding gun for argon arc welding to reduce the volume of the welding gun, reduce the arc pressure at the end of the tungsten pole during high current welding, reduce the probability of hump weld formation, improve welding efficiency, and reduce the dilution rate is a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The object of the present invention is to provide a welding gun for argon arc welding in view of the defects and shortcomings in the prior art, which can reduce the volume of the welding gun and reduce the arc pressure at the end of the tungsten pole during high current welding, so as to reduce the probability of forming a hump weld, improve welding efficiency and reduce the dilution rate.

[0005] To achieve the above object, the technical solution adopted by the present invention is:

[0006] The present invention provides a welding gun for argon arc welding, comprising a welding torch, an electrode installed inside the welding torch and a welding wire feeding device that moves synchronously with the electrode, wherein a first through hole is provided inside the electrode, and the first through hole extends along the axial direction of the electrode and passes through both ends of the electrode; the welding wire feeding device comprises two wire feeding tubes for feeding welding wire, all of the wire feeding tubes are located on the same side of the welding direction, the two wire feeding tubes are symmetrically arranged relative to the electrode, and the ends of all the wire feeding tubes point to the electrode.

[0007] Preferably, the outer diameter of the electrode is 5 mm to 7 mm, and the inner diameter of the first through hole is 1.5 mm to 3 mm.

[0008] Preferably, a nozzle is installed at the end of the welding torch, a second through hole is provided inside the nozzle, a first mounting hole is provided inside the welding torch, the first mounting hole and the second through hole are connected to form a channel for accommodating an electrode, the electrode is installed in the channel and can move along the channel to extend to the outside of the nozzle.

[0009] Preferably, an electrode clamp is provided inside the first mounting hole, a third through hole is provided inside the electrode clamp, the electrode is placed in the third through hole, and the cross-sectional area of ​​the outlet of the third through hole near the welding area is smaller than the cross-sectional area of ​​the electrode, and at least two notches are provided at the end of the electrode clamp near the outlet, and an opening is provided at one end of the notch facing the welding area, so as to divide the end of the electrode clamp into at least two petal-shaped structures that can be opened and closed;

[0010] A locking mechanism is provided inside one end of the first through hole away from the welding area. The locking mechanism is provided with a pushing portion abutting against the electrode. The pushing portion is placed in the third through hole and is slidably connected to the third through hole.

[0011] Preferably, a shoulder is provided at the end of the pushing portion connected to the locking mechanism, the setting position of the shoulder corresponds to the end of the electrode clamp away from the welding area, and the distance between the shoulder and the pushing portion is adapted to the length of the electrode extending out of the nozzle.

[0012] Preferably, a conductive nozzle is installed at the end of the wire feeding tube, and the welding wire placed in the wire feeding tube passes through the conductive nozzle and extends to the outside of the conductive nozzle; a conductive nozzle cooling device is provided on the outside of the conductive nozzle, and a first cooling medium circulation channel is provided inside the conductive nozzle cooling device, and the first cooling medium circulation channel surrounds the outer circumference of the conductive nozzle.

[0013] Preferably, the welding wire feeding device also includes a connecting plate, which is provided with a second mounting hole for mounting the welding torch and a third mounting hole for mounting the wire feeding tube, the welding torch is detachably connected to the second mounting hole through a first insulating sleeve, and the wire feeding tube is detachably connected to the third mounting hole through a second insulating sleeve.

[0014] Preferably, it also includes a cooling medium circulation channel and a shielding gas delivery channel, the electrode is respectively matched with the first mounting hole and the second through hole gap, and the gap between the first mounting hole and the electrode and the gap between the electrode and the second through hole are connected to form a gas delivery channel for delivering shielding gas, one end of the gas delivery channel is connected to the gas source through a shielding gas joint, and the other end is connected to the welding area through the gap between the electrode and the second through hole.

[0015] Preferably, an air screen is provided inside the second through hole, and one end of the air screen away from the welding area is detachably connected to the welding torch.

[0016] Preferably, the cooling medium circulation channel comprises a second cooling medium circulation channel and a third cooling medium circulation channel, the second cooling medium circulation channel is located inside the welding torch and surrounds the periphery of the electrode;

[0017] A nozzle cooling protection sleeve is disposed outside the nozzle, the third cooling medium circulation channel is located inside the nozzle cooling protection sleeve, and the third cooling medium circulation channel surrounds the outer circumference of the nozzle.

[0018] Compared with the prior art, the present invention has achieved the following technical effects:

[0019] The present invention reduces the volume of the argon arc welding torch by installing a hollow electrode inside the welding torch and arranging a double-path wire feeding tube compared to the double tungsten electrode arrangement, so that the argon arc welding torch can be suitable for welding small-diameter workpieces; compared to the solid electrode used in the prior art, the hollow electrode can reduce the arc pressure when the same current is passed, reduce the probability of a hump weld bead occurring in the welding torch during high-current and high-speed welding, and improve welding stability; the double-path wire feeding can not only improve welding efficiency and reduce dilution rate, but also reduce the wire feeding current of each path, thereby reducing interference to the welding arc and further improving welding stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a schematic diagram of the axial structure of a welding gun for argon arc welding;

[0022] Figure 2 It is a schematic diagram of the cross-sectional structure of a welding gun for argon arc welding;

[0023] Figure 3 It is a schematic diagram of the enlarged structure at A;

[0024] Figure 4-5 It is a schematic diagram of the axial structure of the welding gun for argon arc welding from other angles;

[0025] Figure 6 It is a schematic diagram of the main structure of a welding gun for argon arc welding;

[0026] Figure 7 It is a schematic diagram of the top view of the structure of a welding gun for argon arc welding;

[0027] Figure 8 is a schematic diagram of the structure of the electrode clamp;

[0028] Fig. 9 is a schematic diagram of the cross-sectional structure of the electrode clamp;

[0029] Fig.10 A schematic diagram of the side structure of the electrode clamp.

[0030] Among them, 100, welding torch; 110, first mounting hole; 120, second cooling medium circulation channel; 200, electrode; 210, first through hole; 300, wire feeding tube; 400, nozzle; 410, second through hole; 500, electrode clamp; 510, third through hole; 520, notch; 530, petal structure; 600, locking mechanism; 610, pushing part; 620, shoulder; 700, conductive nozzle; 800, conductive nozzle cooling Device; 900, connecting plate; 910, second mounting hole; 920, third mounting hole; 930, fourth mounting hole; 1000, first insulating sleeve; 1010, first flange; 1100, second insulating sleeve; 1110, second flange; 1200, protective gas connector; 1300, gas screen; 1400, cooling protective sleeve; 1410, third cooling medium circulation channel; 1500, water and electricity connector; 1600, hot wire connector. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] like Figures 1 to 10 As shown, the present invention provides a welding gun for argon arc welding, which can also be called a 12-meter-long pipeline inner wall corrosion-resistant layer hollow tungsten electrode side-axis double hot wire argon arc high-speed cladding gun head, comprising a welding torch 100, an electrode 200 installed inside the welding torch 100 and a welding wire feeding device that moves synchronously with the electrode 200, a first through hole 210 is provided inside the electrode 200, the first through hole 210 extends along the axial direction of the electrode 200 and passes through both ends of the electrode 200; the welding wire feeding device comprises two wire feeding tubes 300 for conveying welding wire, all the wire feeding tubes 300 are located on the same side of the welding direction, the two wire feeding tubes 300 are symmetrically arranged relative to the electrode 200, and the ends of all the wire feeding tubes 300 point to the electrode 200.

[0034] If the wire feeding tube 300 is located in front of the electrode 200 along the welding direction, one of the wire feeding tubes 300 is located on the left front side of the electrode 200, and the other wire feeding tube 300 is located on the right front side of the electrode 200; if the wire feeding tube 300 is located at the rear of the electrode 200 along the welding direction, one of the wire feeding tubes 300 is located on the left rear side of the electrode 200, and the other wire feeding tube 300 is located on the right rear side of the electrode 200.

[0035] Firstly, by setting up a single-pole double-wire welding device, the insulating protection structure set between the two tungsten electrodes is omitted, and the volume of the welding gun can be greatly reduced compared with the bipolar welding gun, so that it can be suitable for welding small-diameter workpieces, and the position of the tungsten electrode is avoided to change due to the thermal expansion and contraction of the insulating protective sleeve during welding, resulting in changes in weld formation and cladding dilution rate, thereby improving welding stability. Compared with the double tungsten electrodes, the control of the single tungsten electrode is relatively simple; secondly, by setting the first through hole 210 inside the electrode 200, the flow density of the plasma is reduced, thereby reducing the pressure on the surface of the workpiece, that is, the electric Arc pressure: when the same current is passed, the arc pressure at the end of the electrode 200 of the present application is smaller than the arc pressure at the end of a conventional solid electrode, so that the welding device of the present application is not easy to cause a hump weld under high-current and high-speed welding, thereby improving welding stability and welding quality; in addition, by setting two wire feeding tubes 300 for dual-path wire feeding, it is possible to not only improve welding efficiency and reduce dilution rate, but also reduce wire feeding speed, reduce the length of welding wire that needs to be melted in each path per unit time, and reduce the wire feeding current of each path, thereby reducing interference with the welding arc and further improving welding stability.

[0036] The electrode 200 can be a graphite electrode, a copper electrode, a ceramic electrode, a tungsten steel alloy electrode, a tungsten electrode, etc. In one embodiment, the electrode 200 is a tungsten electrode, and the outer diameter of the electrode 200 is 5 mm to 7 mm, the inner diameter of the first through hole 210 is 1.5 mm to 3 mm, and the end of the electrode 200 is a conical structure with a gradually decreasing cross-sectional area, and the angle between the outer surface at the tip of the electrode 200 and the axis is 30° to 45°.

[0037] A nozzle 400 is installed at the end of the welding torch 100, a first mounting hole 110 is provided inside the welding torch 100, a second through hole 410 is provided inside the nozzle 400, the first mounting hole 110 and the second through hole 410 are connected to form a channel for accommodating the electrode, and the electrode 200 is installed in the channel and can move along the channel to extend to the outside of the nozzle 400.

[0038] In order to facilitate the adjustment of the length of the electrode 200 extending out of the nozzle 400, an electrode clamp 500 is provided inside the first mounting hole 110, and a third through hole 510 is provided inside the electrode clamp 500. The electrode 200 is placed in the third through hole 510. The outlet cross-sectional area of ​​the third through hole 510 near the welding area is smaller than the cross-sectional area of ​​the electrode 200. A notch 520 with an open end is provided at the outlet end of the electrode clamp 500 near the third through hole 510. The notch 520 has at least two notches to divide the end of the electrode clamp 500 into a petal-shaped structure 530 that can be opened and closed; the number of notches 520 can be adjusted as needed to ensure that the electrode 200 can be smoothly extended. A locking mechanism 600 is provided at one end of the electrode 200 away from the welding area. The locking mechanism 600 is provided with a pushing portion 610 that abuts against the electrode 200. The pushing portion 610 is placed in the third through hole 510 and is slidably connected to the third through hole 510. When in use, a force is applied to the pushing portion 610 , so that the pushing portion 610 pushes the electrode 200 to move toward the welding area and spreads the petal-shaped structure 530 , thereby fixing the electrode 200 inside the first mounting hole 110 .

[0039] In order to facilitate the control of the extension length of the electrode 200, a shoulder 620 is provided at the end where the pushing portion 610 is connected to the locking mechanism 600. The setting position of the shoulder 620 corresponds to the end of the electrode clamp 500 away from the welding area, and the distance between the shoulder 620 and the pushing portion 610 is adapted to the length that the electrode 200 needs to extend out of the nozzle 400, so that when the shoulder 620 of the locking mechanism 600 abuts against the end of the electrode clamp 500, the length of the electrode 200 extending out of the nozzle 400 is exactly the length required for welding, thereby improving the convenience of operation.

[0040] If the locking mechanism 600 is directly inserted into the first mounting hole 110 and can slide forward and backward along the first mounting hole 110, the locking mechanism 600 can be easily disengaged from the first mounting hole 110. For this reason, in one embodiment, the locking mechanism 600 is threadedly connected to the first mounting hole 110, so that the locking mechanism 600 is not easy to be disengaged from the first mounting hole 110 under the engagement of the thread, and the length of the electrode 200 extended can also be controlled by the number of turns of the locking mechanism 600, further improving the convenience of operation.

[0041] A conductive tip 700 is installed at the end of the wire feeding tube 300. The conductive tip 700 is placed on a side close to the welding area. The welding wire placed in the wire feeding tube 300 passes through the conductive tip 700 and extends to the outside of the conductive tip 700. A conductive tip cooling device 800 is provided on the outside of the conductive tip 700. A first cooling medium circulation channel is provided inside the conductive tip cooling device 800. The first cooling medium circulation channel surrounds the outer periphery of the conductive tip 700. By setting two-way wire feeding tubes 300, the wire feeding speed can be reduced. For example, if the wire feeding speed is 4m / min during single-way wire feeding, the wire feeding speed of each way can be controlled to 2m / min after double-way wire feeding, so that the wire feeding speed is halved. Since the outlet of the conductive tip 700 is compatible with the diameter of the welding wire, reducing the wire feeding speed can reduce the wear of the welding wire on the conductive tip 700, avoid the situation that the welding wire position shakes due to the enlargement of the outlet of the conductive tip 700 during welding, and improve the stability of the welding wire position during welding. In addition, the wear between the welding wire and the conductive tip 700 is reduced, and the accumulation of metal debris generated by wear at the conductive tip 700 can also be reduced, so that welding wires with relatively low surface quality and welding wires with different diameters in the same batch can also pass through the conductive tip 700 smoothly, reducing the requirements for welding wire quality and reducing production costs. Furthermore, by cooling the conductive tip 700 through the conductive tip cooling device 800, the wear resistance of the conductive tip 700 can be improved, the wear amount of the conductive tip 700 during wire feeding can be further reduced, the service life of the conductive tip 700 can be increased, the frequency of replacing the conductive tip 700 during 12-meter-long pipe welding can be reduced, the welding joints can be reduced, and the welding quality can be improved.

[0042] The synchronous movement between the welding torch 100 and the welding wire feeding device can be achieved by controlling the synchronous movement of the mechanism that drives the welding torch 100 and the mechanism that drives the welding wire feeding device, or the welding torch 100 and the welding wire feeding device can be connected to achieve the synchronous movement of the two under the drive of a motion mechanism. In one embodiment, the welding wire feeding device also includes a connecting plate 900, and the connecting plate 900 is provided with a second mounting hole 910 for mounting the welding torch 100 and a third mounting hole 920 for mounting the wire feeding tube 300. A first insulating sleeve 1000 is provided in the annular area between the welding torch 100 and the second mounting hole 910. The first insulating sleeve 1000 is respectively fitted with the inner wall of the second mounting hole 910 and the outer surface of the welding torch 100 to achieve an insulated connection between the welding torch 100 and the connecting plate 900, and in order to provide The installation stability of the welding torch 100 in the second mounting hole 910 is improved. The end of the first insulating sleeve 1000 away from the welding area is provided with a first flange 1010, and the first flange 1010 abuts against the end surface of the connecting plate 900. A second insulating sleeve 1100 is provided in the annular area between the wire feeding tube 300 and the third mounting hole 920, and the second insulating sleeve 1100 is respectively fitted with the inner wall of the third mounting hole 920 and the outer surface of the wire feeding tube 300 to achieve an insulating connection between the wire feeding tube 300 and the connecting plate 900. A second flange 1110 is provided on the side of the second insulating sleeve 1100 away from the welding area, and the second flange 1110 abuts against the end surface of the connecting plate 900. In one embodiment, the wire feeding tube 300 is a wire feeding copper tube, and the end of the third mounting hole 920 away from the second mounting hole 910 is open, and the connecting plate 900 is provided with a fourth mounting hole 930 that can penetrate all the openings, and the threaded connector is installed in the fourth mounting hole 930. When in use, take out the threaded connector, install the wire feeding tube 300 wrapped with the second insulating sleeve 1100 into the third mounting hole 920, and then tighten the threaded connector to firmly fix the wire feeding tube 300 in the third mounting hole 920. A hot wire connector 1600 is also provided at the end of the wire feeding tube 300 away from the welding area, and the hot wire connector 1600 is used to realize the connection between the wire feeding tube 300 and the stainless steel wire feeding hose.

[0043] The welding torch for argon arc welding also includes a cooling medium circulation channel, a shielding gas delivery channel and a welding wire delivery device that moves synchronously with the electrode 200. The electrode 200 is respectively matched with the first mounting hole 110 and the second through hole 410. The gap between the first mounting hole 110 and the electrode 200 is called the first gap, and the gap between the electrode 200 and the second through hole 410 is called the second gap. The first gap and the second gap are connected to form a gas delivery channel for delivering shielding gas. A shielding gas connector 1200 is provided on the welding torch 100. One end of the gas delivery channel is connected to the gas source through the shielding gas connector 1200, and the other end of the gas delivery channel is connected to the welding area through the second gap. The shielding gas introduced can be argon, helium, hydrogen, carbon dioxide, a mixed gas, etc. In order to ensure that the shielding gas can be stably and evenly delivered to the welding area and provide better protection for the welding point, a gas screen 1300 is provided inside the second through hole 410, and the end of the gas screen 1300 away from the second through hole 410 is detachably connected to the welding torch 100. The gas screen 1300 can use existing components, and the present application does not make any improvements to the structure of the gas screen 1300.

[0044] The cooling medium circulation channel includes a second cooling medium circulation channel 120 and a third cooling medium circulation channel 1410, wherein the second cooling medium circulation channel 120 is located inside the welding torch 100 and surrounds the outer periphery of the electrode 200 to cool the electrode 200; a cooling protective sleeve 1400 is provided outside the nozzle 400, and the third cooling medium circulation channel 1410 is located inside the cooling protective sleeve 1400 and surrounds the outer periphery of the nozzle 400 to cool the nozzle 400. In one embodiment, the nozzle 400 is a ceramic nozzle, and the provision of the cooling protective sleeve 1400 can prevent the ceramic nozzle from being cracked under high current, high temperature and long-term welding. The cooling medium can be oil, dry ice, water, etc. In one embodiment, the cooling medium introduced into the first cooling medium circulation channel, the second cooling medium circulation channel 120 and the third cooling medium circulation channel 1410 is water, and two water-electricity joints 1500 are installed on the conductive nozzle cooling device 800, the welding torch 100 and the cooling protective sleeve 1400 to realize the circulation flow of the double-path conductive and cooling medium.

[0045] It should be noted that it is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention, and any figure mark in the claims should not be regarded as limiting the claims involved.

Claims

1. A welding gun for argon arc welding, characterized in that: It comprises a welding torch, an electrode installed inside the welding torch and a welding wire feeding device moving synchronously with the electrode, wherein a first through hole is provided inside the electrode, and the first through hole extends along the axial direction of the electrode and passes through both ends of the electrode; The welding wire feeding device comprises two wire feeding tubes for feeding welding wire, all the wire feeding tubes are located on the same side of the welding direction, the two wire feeding tubes are symmetrically arranged relative to the electrode, and the ends of all the wire feeding tubes point to the electrode.

2. The argon arc welding torch according to claim 1, characterized in that: The outer diameter of the electrode is 5 mm to 7 mm, and the inner diameter of the first through hole is 1.5 mm to 3 mm.

3. The argon arc welding torch according to claim 2, characterized in that: A nozzle is installed at the end of the welding torch, a second through hole is provided inside the nozzle, a first mounting hole is provided inside the welding torch, the first mounting hole and the second through hole are connected to form a channel for accommodating an electrode, the electrode is installed in the channel and can move along the channel to extend to the outside of the nozzle.

4. The argon arc welding torch according to claim 3, characterized in that: An electrode clamp is provided inside the first mounting hole, a third through hole is provided inside the electrode clamp, the electrode is placed in the third through hole, and the cross-sectional area of ​​the outlet of the third through hole near the welding area is smaller than the cross-sectional area of ​​the electrode, at least two notches are provided at the end of the electrode clamp near the outlet, and an opening is provided at one end of the notch facing the welding area, so as to divide the end of the electrode clamp into at least two petal-shaped structures that can be opened and closed; A locking mechanism is provided inside one end of the first through hole away from the welding area. The locking mechanism is provided with a pushing portion abutting against the electrode. The pushing portion is placed in the third through hole and is slidably connected to the third through hole.

5. The argon arc welding torch according to claim 4, characterized in that: The end of the pushing portion connected to the locking mechanism is provided with a shoulder, the setting position of the shoulder corresponds to the end of the electrode clamp away from the welding area, and the distance between the shoulder and the pushing portion is adapted to the length of the electrode extending out of the nozzle.

6. The argon arc welding torch according to claim 1, characterized in that: A conductive nozzle is installed at the end of the wire feeding tube, and the welding wire placed in the wire feeding tube passes through the conductive nozzle and extends to the outside of the conductive nozzle; a conductive nozzle cooling device is provided outside the conductive nozzle, and a first cooling medium circulation channel is provided inside the conductive nozzle cooling device, and the first cooling medium circulation channel surrounds the outer circumference of the conductive nozzle.

7. The argon arc welding torch according to claim 1, characterized in that: The welding wire feeding device also includes a connecting plate, on which a second mounting hole for mounting the welding torch and a third mounting hole for mounting the wire feeding tube are provided. The welding torch is detachably connected to the second mounting hole via a first insulating sleeve, and the wire feeding tube is detachably connected to the third mounting hole via a second insulating sleeve.

8. The argon arc welding torch according to any one of claims 3 to 7, characterized in that: It also includes a cooling medium circulation channel and a shielding gas delivery channel. The electrode is respectively matched with the first mounting hole and the second through hole gap, and the gap between the first mounting hole and the electrode and the gap between the electrode and the second through hole are connected to form a gas delivery channel for delivering shielding gas. One end of the gas delivery channel is connected to the gas source through a shielding gas joint, and the other end is connected to the welding area through the gap between the electrode and the second through hole.

9. The argon arc welding torch according to claim 8, characterized in that: An air screen is provided inside the second through hole, and one end of the air screen away from the welding area is detachably connected to the welding torch.

10. The argon arc welding torch according to claim 8, characterized in that: The cooling medium circulation channel includes a second cooling medium circulation channel and a third cooling medium circulation channel, wherein the second cooling medium circulation channel is located inside the welding torch and surrounds the outer circumference of the electrode; A nozzle cooling protection sleeve is disposed outside the nozzle, the third cooling medium circulation channel is located inside the nozzle cooling protection sleeve, and the third cooling medium circulation channel surrounds the outer circumference of the nozzle.

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